24
Factory settings
*) 200-240 V motors: Operation is guaranteed up to 280 VAC.
100-115 V motors: Operation is guaranteed up to 150 VAC.
In order to avoid unnecessary stops, the overvoltage stop limit is as stated.
Accuracy of R100 readings
Operation
Sensor
The sensor signal accuracy depends on the sensor
type. See the sensor specifications in question.
7.1 Electrical connection
The supply voltage and frequency are marked on the
nameplate. Make sure that the CU 301 is suitable for
the electricity supply on which it will be used.
The CU 301 has two terminal blocks:
• Screw terminals 1 to 4.
• Spring terminals 5 to 7.
Furthermore, the CU 301 is equipped with two screw
terminals for the protective earth leads (PE).
The CU 301 is supplied with special gaskets for the
Pg cable entries. The special gaskets are suitable for
flat cables and single-core cables.
The on/off button on the CU 301 must not be used as
a safety switch when installing and servicing the
pump.
Alarm
200-240 V motors 100-115 V motors
0.1 - 0.63 kW 0.7 - 1.05 kW 1.1 - 1.73 kW 0.1 - 0.63 kW
Sensor defective 4-20 mA (the value is stored in the CU 301)
Overload 5 A 8 A 11 A 11 A
Overtemperature
Stop limit: 65°C Stop limit: 75°C Stop limit: 85°C Stop limit: 85°C
Restart: 55°C Restart: 65°C Restart: 75°C Restart: 75°C
Speed reduction In connection with undervoltage or overload
Overvoltage *) 320 VAC 320 VAC 320 VAC 185 VAC
Undervoltage
Speed reduction:
190 V
Speed reduction:
190 V
Speed reduction:
210 V
Speed reduction:
90 V
Stop limit: 150 V Stop limit: 150 V Stop limit: 150 V Stop limit: 75 V
Dry running 300 W 680 W 800 W 300 W
Display Accuracy
5.2.2 Actual pressure ±0.1 bar
5.2.3 Speed ±1%
5.2.4 Temperature ±5%
5.2.5 Power input and
power consumption
±5%
Never make any connections on the
CU 301 terminal block unless the electric-
ity supply has been switched off. The
CU 301 must be connected in accordance
with the local rules and standards in force
for the application in question.
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